The National Coalition for Syrian Revolutionary and Opposition Forces made the announcement Tuesday.
The contingent government's formation should assuage concerns from the West -- particularly the United States -- about who would lead Syria should al-Assad be deposed, the Syrian American Council said.
"This question has now been answered," the group said.
For two years, the lack of a clear alternative to al-Assad's government has hampered the opposition's efforts in gaining more international support. Some say the absence of an alternative leader has helped prolong the bloodshed.
It didn't take long for Hitto to declare what many in the opposition have said: "There will be no dialogue with the Assad regime."